Disallow pickle.load unless TRUST_REMOTE_CODE=True

docs/source/en/model_doc/transfo-xl.md

@@ -22,11 +22,17 @@ This model is in maintenance mode only, so we won't accept any new PRs changing
 
 We recommend switching to more recent models for improved security.
 
-In case you would still like to use `TransfoXL` in your experiments, we recommend using the [Hub checkpoint](https://huggingface.co/transfo-xl-wt103) with a specific revision to ensure you are downloading safe files from the Hub:
+In case you would still like to use `TransfoXL` in your experiments, we recommend using the [Hub checkpoint](https://huggingface.co/transfo-xl-wt103) with a specific revision to ensure you are downloading safe files from the Hub.
 
-```
+You will need to set the environment variable `TRUST_REMOTE_CODE` to `True` in order to allow the
+usage of `pickle.load()`:
+
+```python
+import os
 from transformers import TransfoXLTokenizer, TransfoXLLMHeadModel
 
+os.environ["TRUST_REMOTE_CODE"] = "True"
+
 checkpoint = 'transfo-xl-wt103'
 revision = '40a186da79458c9f9de846edfaea79c412137f97'
 

src/transformers/models/deprecated/transfo_xl/tokenization_transfo_xl.py

@@ -34,6 +34,7 @@
     is_torch_available,
     logging,
     requires_backends,
+    strtobool,
     torch_only_method,
 )
 
@@ -212,6 +213,14 @@ def __init__(
             vocab_dict = None
             if pretrained_vocab_file is not None:
                 # Priority on pickle files (support PyTorch and TF)
+                if not strtobool(os.environ.get("TRUST_REMOTE_CODE", "False")):
+                    raise ValueError(
+                        "This part uses `pickle.load` which is insecure and will execute arbitrary code that is "
+                        "potentially malicious. It's recommended to never unpickle data that could have come from an "
+                        "untrusted source, or that could have been tampered with. If you already verified the pickle "
+                        "data and decided to use it, you can set the environment variable "
+                        "`TRUST_REMOTE_CODE` to `True` to allow it."
+                    )
                 with open(pretrained_vocab_file, "rb") as f:
                     vocab_dict = pickle.load(f)
 
@@ -790,6 +799,13 @@ def get_lm_corpus(datadir, dataset):
         corpus = torch.load(fn_pickle)
     elif os.path.exists(fn):
         logger.info("Loading cached dataset from pickle...")
+        if not strtobool(os.environ.get("TRUST_REMOTE_CODE", "False")):
+            raise ValueError(
+                "This part uses `pickle.load` which is insecure and will execute arbitrary code that is potentially "
+                "malicious. It's recommended to never unpickle data that could have come from an untrusted source, or "
+                "that could have been tampered with. If you already verified the pickle data and decided to use it, "
+                "you can set the environment variable `TRUST_REMOTE_CODE` to `True` to allow it."
+            )
         with open(fn, "rb") as fp:
             corpus = pickle.load(fp)
     else:

src/transformers/models/rag/retrieval_rag.py

@@ -23,7 +23,7 @@
 
 from ...tokenization_utils import PreTrainedTokenizer
 from ...tokenization_utils_base import BatchEncoding
-from ...utils import cached_file, is_datasets_available, is_faiss_available, logging, requires_backends
+from ...utils import cached_file, is_datasets_available, is_faiss_available, logging, requires_backends, strtobool
 from .configuration_rag import RagConfig
 from .tokenization_rag import RagTokenizer
 
@@ -131,6 +131,13 @@ def _resolve_path(self, index_path, filename):
     def _load_passages(self):
         logger.info(f"Loading passages from {self.index_path}")
         passages_path = self._resolve_path(self.index_path, self.PASSAGE_FILENAME)
+        if not strtobool(os.environ.get("TRUST_REMOTE_CODE", "False")):
+            raise ValueError(
+                "This part uses `pickle.load` which is insecure and will execute arbitrary code that is potentially "
+                "malicious. It's recommended to never unpickle data that could have come from an untrusted source, or "
+                "that could have been tampered with. If you already verified the pickle data and decided to use it, "
+                "you can set the environment variable `TRUST_REMOTE_CODE` to `True` to allow it."
+            )
         with open(passages_path, "rb") as passages_file:
             passages = pickle.load(passages_file)
         return passages
@@ -140,6 +147,13 @@ def _deserialize_index(self):
         resolved_index_path = self._resolve_path(self.index_path, self.INDEX_FILENAME + ".index.dpr")
         self.index = faiss.read_index(resolved_index_path)
         resolved_meta_path = self._resolve_path(self.index_path, self.INDEX_FILENAME + ".index_meta.dpr")
+        if not strtobool(os.environ.get("TRUST_REMOTE_CODE", "False")):
+            raise ValueError(
+                "This part uses `pickle.load` which is insecure and will execute arbitrary code that is potentially "
+                "malicious. It's recommended to never unpickle data that could have come from an untrusted source, or "
+                "that could have been tampered with. If you already verified the pickle data and decided to use it, "
+                "you can set the environment variable `TRUST_REMOTE_CODE` to `True` to allow it."
+            )
         with open(resolved_meta_path, "rb") as metadata_file:
             self.index_id_to_db_id = pickle.load(metadata_file)
         assert (

tests/models/rag/test_retrieval_rag.py

@@ -14,7 +14,6 @@
 
 import json
 import os
-import pickle
 import shutil
 import tempfile
 from unittest import TestCase
@@ -174,37 +173,6 @@ def get_dummy_custom_hf_index_retriever(self, from_disk: bool):
             )
         return retriever
 
-    def get_dummy_legacy_index_retriever(self):
-        dataset = Dataset.from_dict(
-            {
-                "id": ["0", "1"],
-                "text": ["foo", "bar"],
-                "title": ["Foo", "Bar"],
-                "embeddings": [np.ones(self.retrieval_vector_size + 1), 2 * np.ones(self.retrieval_vector_size + 1)],
-            }
-        )
-        dataset.add_faiss_index("embeddings", string_factory="Flat", metric_type=faiss.METRIC_INNER_PRODUCT)
-
-        index_file_name = os.path.join(self.tmpdirname, "hf_bert_base.hnswSQ8_correct_phi_128.c_index")
-        dataset.save_faiss_index("embeddings", index_file_name + ".index.dpr")
-        pickle.dump(dataset["id"], open(index_file_name + ".index_meta.dpr", "wb"))
-
-        passages_file_name = os.path.join(self.tmpdirname, "psgs_w100.tsv.pkl")
-        passages = {sample["id"]: [sample["text"], sample["title"]] for sample in dataset}
-        pickle.dump(passages, open(passages_file_name, "wb"))
-
-        config = RagConfig(
-            retrieval_vector_size=self.retrieval_vector_size,
-            question_encoder=DPRConfig().to_dict(),
-            generator=BartConfig().to_dict(),
-            index_name="legacy",
-            index_path=self.tmpdirname,
-        )
-        retriever = RagRetriever(
-            config, question_encoder_tokenizer=self.get_dpr_tokenizer(), generator_tokenizer=self.get_bart_tokenizer()
-        )
-        return retriever
-
     def test_canonical_hf_index_retriever_retrieve(self):
         n_docs = 1
         retriever = self.get_dummy_canonical_hf_index_retriever()
@@ -288,33 +256,6 @@ def test_custom_hf_index_retriever_save_and_from_pretrained_from_disk(self):
             out = retriever.retrieve(hidden_states, n_docs=1)
             self.assertTrue(out is not None)
 
-    def test_legacy_index_retriever_retrieve(self):
-        n_docs = 1
-        retriever = self.get_dummy_legacy_index_retriever()
-        hidden_states = np.array(
-            [np.ones(self.retrieval_vector_size), -np.ones(self.retrieval_vector_size)], dtype=np.float32
-        )
-        retrieved_doc_embeds, doc_ids, doc_dicts = retriever.retrieve(hidden_states, n_docs=n_docs)
-        self.assertEqual(retrieved_doc_embeds.shape, (2, n_docs, self.retrieval_vector_size))
-        self.assertEqual(len(doc_dicts), 2)
-        self.assertEqual(sorted(doc_dicts[0]), ["text", "title"])
-        self.assertEqual(len(doc_dicts[0]["text"]), n_docs)
-        self.assertEqual(doc_dicts[0]["text"][0], "bar")  # max inner product is reached with second doc
-        self.assertEqual(doc_dicts[1]["text"][0], "foo")  # max inner product is reached with first doc
-        self.assertListEqual(doc_ids.tolist(), [[1], [0]])
-
-    def test_legacy_hf_index_retriever_save_and_from_pretrained(self):
-        retriever = self.get_dummy_legacy_index_retriever()
-        with tempfile.TemporaryDirectory() as tmp_dirname:
-            retriever.save_pretrained(tmp_dirname)
-            retriever = RagRetriever.from_pretrained(tmp_dirname)
-            self.assertIsInstance(retriever, RagRetriever)
-            hidden_states = np.array(
-                [np.ones(self.retrieval_vector_size), -np.ones(self.retrieval_vector_size)], dtype=np.float32
-            )
-            out = retriever.retrieve(hidden_states, n_docs=1)
-            self.assertTrue(out is not None)
-
     @require_torch
     @require_tokenizers
     @require_sentencepiece